Jigoshop Plugin Wrapping into Creativix Theme

We’re thinking of using Jigoshop for our website cart functionality as it is capable of all the features we’re looking for. However, as could be expected, Jigoshop carries its own CSS. We’ve read most of the threads concerning wrapping Jigoshop using hooks, but want to be certain before committing. Has anyone wrapped Jigoshop using a theme other than twenty-ten or twenty-eleven?
The threads say to examine a particular .php file with <?php get_header(); ?> present. Examination of a portion of our page.php file gives us this:

Is this the correct file to determine the divs to wrap with? That is to say, do we need to hook Jigoshop with the “sub-column,” “sub-top,” and “sub-content” IDs. Instead of the Jigoshop’s integral divs?
Has anyone else done this with the Creativix theme? Let us know if we’re on the right track.
So, accordingly, I should create a new “functions.php” file for my child theme directory with the following content: